CVE-2020-25739

Name: CVE-2020-25739
Creator: NVD / NIST
Published: 2020-09-23T14:15:12.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.38%

Last modified Jun 17, 2026

CVE-2020-25739 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An issue was discovered in the gon gem before gon-6.4.0 for Ruby. MultiJson does not honor the escape_mode parameter to escape fields as an XSS protection mechanism. EPSS estimates a 1.38% chance of exploitation in the next 30 days.

Description

An issue was discovered in the gon gem before gon-6.4.0 for Ruby. MultiJson does not honor the escape_mode parameter to escape fields as an XSS protection mechanism. To mitigate, json_dumper.rb in gon now does escaping for XSS by default without relying on MultiJson.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.38%

68.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Gon Project	Gon	< 6.4.0
Canonical	Ubuntu Linux	18.04
Debian	Debian Linux	9.0

References

https://github.com/gazay/gon/commit/fe3c7b2191a992386dc9edd37de5447a4e809bc7Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00018.htmlMailing List, Third Party Advisory
https://usn.ubuntu.com/4560-1/Third Party Advisory
https://github.com/gazay/gon/commit/fe3c7b2191a992386dc9edd37de5447a4e809bc7Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00018.htmlMailing List, Third Party Advisory
https://usn.ubuntu.com/4560-1/Third Party Advisory

Timeline

Published: Sep 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25739?

How severe is CVE-2020-25739?

CVE-2020-25739 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.38% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25739?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-25739?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST